Causality-induced pulse steepening and shock-like waves in superluminal media
Causality-induced pulse steepening and shock-like waves in superluminal media
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DOI：
10.1209/0295-5075/97/44009
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发表时间：
2012-02-01
期刊：
影响因子：
1.8
通讯作者：
Souza, S. T.
中科院分区：
文献类型：
--
作者：
Hickmann, J. M.;Alencar, M. A. R. C.;Souza, S. T.
利用基于紧支撑函数和完全光滑的无穷可微零强度非分析点的脉冲，证明了一种新的方法来模拟通过反常色散介质的信息传播。信息可以明确地关联到脉冲的前沿的非分析点，其速度在快光介质中的数值和实验研究。我们已经清楚地观察到，这个非分析点的速度受爱因斯坦因果关系的约束，并且当脉冲的群速度是超光速时，它正好等于真空c中的光速。此外，我们观察到，因果关系也可以导致陡峭化和脉冲冲击样的效果。版权所有（C）EPLA，2012
Using pulses based on functions with compact support and perfectly smooth infinitely differentiable zero-intensity nonanalytical points, a new approach to model information propagating through an anomalous dispersive medium is demonstrated. Information can be unambiguously associated to the nonanalytical point in the pulse's leading edge, and its velocity investigated numerically and experimentally in fast-light media. We have clearly observed that the velocity of this nonanalytical point is bounded by Einstein causality and it is exactly equal to the light speed in vacuum c when the pulse's group velocity is superluminal. Moreover, we observed that causality can also cause steepening and a pulse shock-like effect. Copyright (C) EPLA, 2012